drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h

   1 /*
   2  * This file is part of the Chelsio T4 Ethernet driver for Linux.
   3  *
   4  * Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #ifndef __CXGB4_OFLD_H
  36 #define __CXGB4_OFLD_H
  37
  38 #include <linux/cache.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/atomic.h>
  42
  43 /* CPL message priority levels */
  44 enum {
  45         CPL_PRIORITY_DATA     = 0,  /* data messages */
  46         CPL_PRIORITY_SETUP    = 1,  /* connection setup messages */
  47         CPL_PRIORITY_TEARDOWN = 0,  /* connection teardown messages */
  48         CPL_PRIORITY_LISTEN   = 1,  /* listen start/stop messages */
  49         CPL_PRIORITY_ACK      = 1,  /* RX ACK messages */
  50         CPL_PRIORITY_CONTROL  = 1   /* control messages */
  51 };
  52
  53 #define INIT_TP_WR(w, tid) do { \
  54         (w)->wr.wr_hi = htonl(FW_WR_OP(FW_TP_WR) | \
  55                               FW_WR_IMMDLEN(sizeof(*w) - sizeof(w->wr))); \
  56         (w)->wr.wr_mid = htonl(FW_WR_LEN16(DIV_ROUND_UP(sizeof(*w), 16)) | \
  57                                FW_WR_FLOWID(tid)); \
  58         (w)->wr.wr_lo = cpu_to_be64(0); \
  59 } while (0)
  60
  61 #define INIT_TP_WR_CPL(w, cpl, tid) do { \
  62         INIT_TP_WR(w, tid); \
  63         OPCODE_TID(w) = htonl(MK_OPCODE_TID(cpl, tid)); \
  64 } while (0)
  65
  66 #define INIT_ULPTX_WR(w, wrlen, atomic, tid) do { \
  67         (w)->wr.wr_hi = htonl(FW_WR_OP(FW_ULPTX_WR) | FW_WR_ATOMIC(atomic)); \
  68         (w)->wr.wr_mid = htonl(FW_WR_LEN16(DIV_ROUND_UP(wrlen, 16)) | \
  69                                FW_WR_FLOWID(tid)); \
  70         (w)->wr.wr_lo = cpu_to_be64(0); \
  71 } while (0)
  72
  73 /* Special asynchronous notification message */
  74 #define CXGB4_MSG_AN ((void *)1)
  75
  76 struct serv_entry {
  77         void *data;
  78 };
  79
  80 union aopen_entry {
  81         void *data;
  82         union aopen_entry *next;
  83 };
  84
  85 /*
  86  * Holds the size, base address, free list start, etc of the TID, server TID,
  87  * and active-open TID tables.  The tables themselves are allocated dynamically.
  88  */
  89 struct tid_info {
  90         void **tid_tab;
  91         unsigned int ntids;
  92
  93         struct serv_entry *stid_tab;
  94         unsigned long *stid_bmap;
  95         unsigned int nstids;
  96         unsigned int stid_base;
  97
  98         union aopen_entry *atid_tab;
  99         unsigned int natids;
 100
 101         unsigned int nftids;
 102         unsigned int ftid_base;
 103
 104         spinlock_t atid_lock ____cacheline_aligned_in_smp;
 105         union aopen_entry *afree;
 106         unsigned int atids_in_use;
 107
 108         spinlock_t stid_lock;
 109         unsigned int stids_in_use;
 110
 111         atomic_t tids_in_use;
 112 };
 113
 114 static inline void *lookup_tid(const struct tid_info *t, unsigned int tid)
 115 {
 116         return tid < t->ntids ? t->tid_tab[tid] : NULL;
 117 }
 118
 119 static inline void *lookup_atid(const struct tid_info *t, unsigned int atid)
 120 {
 121         return atid < t->natids ? t->atid_tab[atid].data : NULL;
 122 }
 123
 124 static inline void *lookup_stid(const struct tid_info *t, unsigned int stid)
 125 {
 126         stid -= t->stid_base;
 127         return stid < t->nstids ? t->stid_tab[stid].data : NULL;
 128 }
 129
 130 static inline void cxgb4_insert_tid(struct tid_info *t, void *data,
 131                                     unsigned int tid)
 132 {
 133         t->tid_tab[tid] = data;
 134         atomic_inc(&t->tids_in_use);
 135 }
 136
 137 int cxgb4_alloc_atid(struct tid_info *t, void *data);
 138 int cxgb4_alloc_stid(struct tid_info *t, int family, void *data);
 139 void cxgb4_free_atid(struct tid_info *t, unsigned int atid);
 140 void cxgb4_free_stid(struct tid_info *t, unsigned int stid, int family);
 141 void cxgb4_remove_tid(struct tid_info *t, unsigned int qid, unsigned int tid);
 142
 143 struct in6_addr;
 144
 145 int cxgb4_create_server(const struct net_device *dev, unsigned int stid,
 146                         __be32 sip, __be16 sport, unsigned int queue);
 147
 148 static inline void set_wr_txq(struct sk_buff *skb, int prio, int queue)
 149 {
 150         skb_set_queue_mapping(skb, (queue << 1) | prio);
 151 }
 152
 153 enum cxgb4_uld {
 154         CXGB4_ULD_RDMA,
 155         CXGB4_ULD_ISCSI,
 156         CXGB4_ULD_MAX
 157 };
 158
 159 enum cxgb4_state {
 160         CXGB4_STATE_UP,
 161         CXGB4_STATE_START_RECOVERY,
 162         CXGB4_STATE_DOWN,
 163         CXGB4_STATE_DETACH
 164 };
 165
 166 struct pci_dev;
 167 struct l2t_data;
 168 struct net_device;
 169 struct pkt_gl;
 170 struct tp_tcp_stats;
 171
 172 struct cxgb4_range {
 173         unsigned int start;
 174         unsigned int size;
 175 };
 176
 177 struct cxgb4_virt_res {                      /* virtualized HW resources */
 178         struct cxgb4_range ddp;
 179         struct cxgb4_range iscsi;
 180         struct cxgb4_range stag;
 181         struct cxgb4_range rq;
 182         struct cxgb4_range pbl;
 183         struct cxgb4_range qp;
 184         struct cxgb4_range cq;
 185         struct cxgb4_range ocq;
 186 };
 187
 188 #define OCQ_WIN_OFFSET(pdev, vres) \
 189         (pci_resource_len((pdev), 2) - roundup_pow_of_two((vres)->ocq.size))
 190
 191 /*
 192  * Block of information the LLD provides to ULDs attaching to a device.
 193  */
 194 struct cxgb4_lld_info {
 195         struct pci_dev *pdev;                /* associated PCI device */
 196         struct l2t_data *l2t;                /* L2 table */
 197         struct tid_info *tids;               /* TID table */
 198         struct net_device **ports;           /* device ports */
 199         const struct cxgb4_virt_res *vr;     /* assorted HW resources */
 200         const unsigned short *mtus;          /* MTU table */
 201         const unsigned short *rxq_ids;       /* the ULD's Rx queue ids */
 202         unsigned short nrxq;                 /* # of Rx queues */
 203         unsigned short ntxq;                 /* # of Tx queues */
 204         unsigned char nchan:4;               /* # of channels */
 205         unsigned char nports:4;              /* # of ports */
 206         unsigned char wr_cred;               /* WR 16-byte credits */
 207         unsigned char adapter_type;          /* type of adapter */
 208         unsigned char fw_api_ver;            /* FW API version */
 209         unsigned int fw_vers;                /* FW version */
 210         unsigned int iscsi_iolen;            /* iSCSI max I/O length */
 211         unsigned short udb_density;          /* # of user DB/page */
 212         unsigned short ucq_density;          /* # of user CQs/page */
 213         void __iomem *gts_reg;               /* address of GTS register */
 214         void __iomem *db_reg;                /* address of kernel doorbell */
 215 };
 216
 217 struct cxgb4_uld_info {
 218         const char *name;
 219         void *(*add)(const struct cxgb4_lld_info *p);
 220         int (*rx_handler)(void *handle, const __be64 *rsp,
 221                           const struct pkt_gl *gl);
 222         int (*state_change)(void *handle, enum cxgb4_state new_state);
 223 };
 224
 225 int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);
 226 int cxgb4_unregister_uld(enum cxgb4_uld type);
 227 int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb);
 228 unsigned int cxgb4_port_chan(const struct net_device *dev);
 229 unsigned int cxgb4_port_viid(const struct net_device *dev);
 230 unsigned int cxgb4_port_idx(const struct net_device *dev);
 231 unsigned int cxgb4_best_mtu(const unsigned short *mtus, unsigned short mtu,
 232                             unsigned int *idx);
 233 void cxgb4_get_tcp_stats(struct pci_dev *pdev, struct tp_tcp_stats *v4,
 234                          struct tp_tcp_stats *v6);
 235 void cxgb4_iscsi_init(struct net_device *dev, unsigned int tag_mask,
 236                       const unsigned int *pgsz_order);
 237 struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
 238                                    unsigned int skb_len, unsigned int pull_len);
 239 #endif  /* !__CXGB4_OFLD_H */